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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4de28f3a830df1d63f518105acc9f34fb0beb27ffece65edca9d4c0b7a4ec56' 
  AND token = 'HKF5eUIEXIwo6yJ4iE1qKXwPhiuCCoObdT1cj8ViZeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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