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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4be37756d44bf02ef565d4e7a219efa553bb400dc2ef81cbce2532903d6f2d06' 
  AND token = '+i1Qcg4EaX1HtfS3IfxKqa+vMic/axvMo95ZOZIA7dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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