Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b98351365b42f4f9784a7c9c1a066c4a525b0c5e5505760f4cfc1fc15d4155f7' 
  AND token = '83ftYDcvDYhnrZpHs180jvdF4iCxOrCd7K5lN8zrRcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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