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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d4c39801ad944328e4977c149989cdc359421a9b4a943271d10384c2430ada0' 
  AND token = 'XidwOMJWIzwO/wJgPkCHhzXVz3F9KP4EzZcpq9fP1BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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