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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '998b76c26dcd506654c1e7d65db2e76a944f944b624fe6292ed4a922a3e95842' 
  AND token = '4KFja6KRVDrKPbamPz8FDNOdgS7s3Ikbjt1eFZbnKuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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