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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b997d0b2cf6e9ff0d5cd9d6a78c4097ea7fbd130af3aa03aa5dbd3aa75674ff7' 
  AND token = 'Hma1IagypJh+XKF1yXUfWEXjoLmH8zXaZmraqEbzuPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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