SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e75402488b83ca33045f2a5d87d896a1653be78f6257dd7c35808e2ea7f15321' 
  AND token = 'Pn47IuzUXVBq0P0OBb3VoUSHHYnQarKWGAlgkhDEL+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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