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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1299a1bf0fdcb0fb6da92149b38a3c8616ae049b25c80903a19b8a9381920fb1' 
  AND token = 'aKShuyS29V0Bv1IB2S5B484fIbAlwZxBlz1nRzFNrwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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