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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f7bacd9c07dae769d12c78b974acf1dda5cf5b6f7ebf90fd3ac4446572b8f6d' 
  AND token = 'mk0r4o/4++r7bwQb42BZJH5745tE5oDkSXSsaqZ+VU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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