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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c54c126f4131a917a3c805d031ee73a10a4ede8acfb460152942c0c153b4835a' 
  AND token = 'g95I8YPj7ycNaV+Eg+0E6/psjJIyCmMeSdBSsQtHsG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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