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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4da81e49a3a26b2f4f8bfb45c1ea6c4caf82b4f6fa76d064a0148ad1ec40c1df' 
  AND token = 'aEX6y6zkXYB+e28DmadhxFWPQ0JKyPdvW+QYn+MEqzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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