SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2eb5976f1511f6ad7cba095a39bcf185ffbadd5c3fb78588f601b0133400669' 
  AND token = 'Rue4hA44RQx+s7Q82gb85hEdCVXA2vF1svhGH/hCjx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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