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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18d6f12ea9e6439386b64c271e7d3ae65aaa8b4c0d5ca4be308f744e5d1925be' 
  AND token = 'Ziu3dwjt0qBqysbLw7UGfbT0RcEM51dBvkdnZb8DWBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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