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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce8923ce34962b50887ae56c5e6c92bc5bdaa760146fd21b68926d9f2a2058a1' 
  AND token = 'ak5CtVWchjh8Z7uaE/9ChQ0c0+fHRDKS3l47aOXsYgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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