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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '457bba903e00b07f64625fcbe5a9461664aca18c5cf3ca17e918a63a10eba59d' 
  AND token = 'G21QKma+uW63eUjxuHnbJkrO1/2zeMXKq9Kp0c7S3Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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