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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fcaf1e4b9a521b985ee0731fb80eff7570237a7c17571c9d0718e5ed4a39329' 
  AND token = 'PjjKqRjbbK5EVyNmqMT7QQNfU7RMjpJYjJAJrr1nEEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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