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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e808c29d0d97097ac93e678866edceae3b5b7f05db67a451355341f8e9ec8c8' 
  AND token = 'nk4+0W+Nww3kc32slSpbi5r5lqgL8ddpdtyVy3JAQpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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