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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f00b6ec5445887ce2d1982ab4de93e73a872004ba08e26097b464387c975f99b' 
  AND token = 'Rac3ktjtlKDION8ST+N67Y4QCh9pcWMi4mV6Ut2lE9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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