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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1deb3b71600deb9c3173d113f75fdd2528cd0ef7039b1d2023bf7cbef240f873' 
  AND token = '2EO/6F1ett/XzKv/9z4/j1+GNH6d4MjogJSCO0OR8F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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