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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cad8a362c42a408bf4748fe9aa9e37ffa7bfc6acea3ffb9d67b1faa9bfdb13b0' 
  AND token = 'TZ67iEF8g8RCcCK4N+sZlF3x9+UjFpuFgT8Si46QmMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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