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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '585dab8ae752d9c3727739295d7a15929cb63768e0b50c4dc92a8b1a3ba3d3c7' 
  AND token = 'xwbST6n6v37H2dv3bKtO8FIq/RYVWspo62ui01+nOXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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