SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdfdcddd8d99d812905077205ef4c5bc476c39f442d512e28f697fad528475d9' 
  AND token = 'IhCvN3aLDKJrsFDMIdV9VouBP/UEPyg+3tuPjdLdELY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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