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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46a7c23e0ec1c5a765b5b5bf02825c5c032db87d910e8e09ead74a7e55fdf98d' 
  AND token = 'lc6hNxwWn8KtC8Fs9fD3L3MQy+T6vagFiBnEQI9k+AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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