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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9afc2bb2f60132bc60e7e86a6358069162484884335bb5e34d1a987d6a49fc3b' 
  AND token = '5j50OUADWGg8u08jn4M3rAYRS7ICMsexUfHlg9PqkJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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