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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '258a564c832bbe51cd5145ee5e2bbfcf16d8d54668cb08e9f88cbd09b774dda0' 
  AND token = 'EU6EedJnOuyBfd3iM9P8xAmbrR56UROZo7553x15hG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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