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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '330bb574ee3e5169c7654adaa587df07c2845de430bcd885cfd5d2db28d9cfce' 
  AND token = 'ozeKYdYdOPYHZ9yBBh9jjIy+oBDv2zNTOL562qfZies=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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