Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ece2a6d966da98f9540ceac4c2c1ac58731a2d6fd6f991b2dec261a4b74a8da4' 
  AND token = 'ASyM+rmktMHYstexqn3kXuTq1fXR9vLFM1TSQt4a04M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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