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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaf5e9efd87dc5fab5c8956d9f6053a9bb27191fdb8c440fa1dadd0cce204460' 
  AND token = 'k1lKmDD7q9+lw8MExzhSUi1IcLGePdh8hBe7Hxji1js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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