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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d1083ea33b9483b88aaad22f764185b123604ff8be40a342da9ccf18ed9a235' 
  AND token = 'axuFzldSNvR+C9r2ZjsUXIVwyNwywqellAJbfUt7E1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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