Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b62a493ae4fa415f8534e13274ebbaaaf51ee120d72087b38f4fb80dcf75d1ee' 
  AND token = 'Vz8NzCIJNy6KVVYJq3yCK/ghLVpS1eidS2rE1cVtZ3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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