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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4cb88a08d359defcf18ae1b34214fa7dee93c2c4f18e3f7b83a9e2e1f932bc7' 
  AND token = 'AuCh6Mfcn5uImxXclyCPg/Tg5nc4Ur/Ge5syNMzE8mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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