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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d52cdc36ec42e6d32619b63e252c1d0a27f21f918b8e7f181832bc9eea09e11' 
  AND token = 'uQwrDJ8jWH9gjFo729eC17etFAWPJog7L2f+GtHHn4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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