SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0ce7ce6d8ccf80162263b7736181bb6ad2dcff8ccf21657616adda971034249' 
  AND token = '3y/fEuWc2UJhjVB/thqc+PqbVCUDEHI+hP0t1wz/SPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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