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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4a2871689c19e1f9d9a4c23b972685ed84d078ea99b5035398670fd643c0c6e' 
  AND token = 'bMc+8rGDHjqfGM8qrv9eUjLoi1XhG/wViirtctOSXS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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