SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b0712acfa58fa8e86ee53745b3f3a673f03cd167dc3555b1a7a990f1b543e46' 
  AND token = 'ZUQN1uTWNjeApiPGzxrfIeCgsN+L0Whr4qcYwOyl0Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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