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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f5a662fc38573599b3c1b981fc512d1ede06fc0d335e1aaef9087bc5d13a074' 
  AND token = 'xG6++6Z4+HJU58EYk2TcaxUcskkvkZgnewlnbRKH/Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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