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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '249e7c0cbb37f68155da0c90ba7f16a7d17137a38690c3fea966e4540d845661' 
  AND token = 'qSSsBrfvc7wRA/l/INJMa/yZ2CsHR71/yFDkgR8Vef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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