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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf231d952ff92a69fe4f8e3c5ffca86d7b4993d96bea47dec9960a35b14ac297' 
  AND token = 'tWfOyPXL0s4TznAMId5PLzx4H/WBt4w9UsGx9UG8rtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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