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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65f9cbbefc653f98263c417047235c5e2b8bdde422fd2c17de7b139d6ca6391c' 
  AND token = 'Os94/Dzdz+60ctA76V+uNS3gAkagedUaBVcXRPilP/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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