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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8438f9b5c5a518e41f91bdf25a6a8ff7c91d1eb004cac29e1372a45b3f2233a' 
  AND token = 'y3yKQ0xW/Q37baGhILB5MT1CwhwuwX8xNXM0aNOOyNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}