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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07b5e6af861e4f89edb37803e446c52fdb7e0ec9abfc2c5b308b7ea9bb7ae1a6' 
  AND token = 'Hc/jWSyqTVjOIjfGsr3sxLhLpHcCuVkd7Vbwp9uNvsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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