SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6260220898a5077ed630ad8fdf9c00923a0b68827df91e394495e3fa3a5bcc9' 
  AND token = 'V9QQ1sJV6/CFnEpvJcoHsgUSZCS68mgylt18gpEGRyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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