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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff43c1473af39ad6e83e5447f0fb797791b0ebdef5a93010b1c6648d89250496' 
  AND token = 'zbWCGNQB6i2pxDJGJ2O/EsFLtzQFR9rUsQYarnd0TBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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